Thanks for answering. With all responses put together, we're doing multi-model GPU rendering next.

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@dougbinks @runevision

Good point. It's C0 continuous but not C1.

Conflictingly, that's fine for old explicit integrators that break down under high stiffness. But not ideal for implicit integrators that handle high stiffness well.

We deal with asymmetry all the time in explicit integrators (e.g. Coulomb friction, which isn't even C0) by managing time steps, force magnitudes and integrator type.

A solution to make it C1 if there is trouble is add a quadratic smooth on the boundary.

@dougbinks FWIW the AttachThreadInput shenanigans is technically true. Another program can call AttachThreadInput on your main thread, and if it has its own window then you'll get that window from GetActiveWindow if it's the active window, instead of null. IDK if I'd consider that deliberate sabotage or a real issue but it's a thing.

I can give you a pair of example apps where one does that to the other if you want them